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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4M датащи(PDF) 24 Page - Holtek Semiconductor Inc |
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HT45F4M датащи(HTML) 24 Page - Holtek Semiconductor Inc |
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24 / 138 page  Rev. 1.10 �4 �an�a�� 1�� �01� Rev. 1.10 �� �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU Bank Pointer – BP Forthisdevice,theDataMemoryisdividedintotwobanks,Bank0andBank1.Selectingthe requiredDataMemoryareaisachievedusingtheBankPointer.Bit0oftheBankPointerisusedto selectDataMemoryBanks0~1. TheDataMemoryisinitialisedtoBank0afterareset,exceptforaWDTtime-outresetinthePower DownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenotedthatthe SpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthattheSpecial FunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheDataMemory willalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer.Accessing datafromBank1mustbeimplementedusingIndirectAddressing. BP Register Bit 7 6 5 4 3 2 1 0 Name — — — — — — — DMBP0 R/W — — — — — — — R/W POR — — — — — — — 0 Bit7~1 Unimplemented,readas"0" Bit0 DMBP0:SelectDataMemoryBanks 0:Bank0 1:Bank1 Accumulator – ACC TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween oneuser-definedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe Accumulatorasnodirecttransferbetweentworegistersispermitted. Program Counter Low Register – PCL Toprovideadditionalprogramcontrolfunctions,thelowbyteoftheProgramCounterismade accessibletoprogrammersbylocatingitwithintheSpecialPurposeareaoftheDataMemory.By manipulatingthisregister,directjumpstootherprogramlocationsareeasilyimplemented.Loading avaluedirectlyintothisPCLregisterwillcauseajumptothespecifiedProgramMemorylocation, however,astheregisterisonly8-bitwide,onlyjumpswithinthecurrentProgramMemorypageare permitted.Whensuchoperationsareused,notethatadummycyclewillbeinserted. Look-up Table Registers – TBLP, TBHP, TBLH Thesethreespecialfunctionregistersareusedtocontroloperationofthelook-uptablewhichis storedintheProgramMemory.TBLPandTBHParethetablepointersandindicatethelocation wherethetabledataislocated.Theirvaluemustbesetupbeforeanytablereadcommandsare executed.Theirvaluecanbechanged,forexampleusingthe“INC”or“DEC”instructions,allowing foreasytabledatapointingandreading.TBLHisthelocationwherethehighorderbyteofthetable dataisstoredafteratablereaddatainstructionhasbeenexecuted.Notethatthelowerordertable databyteistransferredtoauserdefinedlocation. |
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